U.S. patent application number 13/537840 was filed with the patent office on 2013-01-03 for mortise lock.
Invention is credited to Wei-Liang CHIANG, Tsung-Chung HUANG, Ching-Chuan KUO, Cheng-Chung LIU, Song-Gen SHYU, Ju-Lin YANG.
Application Number | 20130000364 13/537840 |
Document ID | / |
Family ID | 46451104 |
Filed Date | 2013-01-03 |
United States Patent
Application |
20130000364 |
Kind Code |
A1 |
HUANG; Tsung-Chung ; et
al. |
January 3, 2013 |
MORTISE LOCK
Abstract
A mortise lock is provided with a reinforcing plate to enhance
structural rigidity and robustness for resistance against external
destructive pulling forces. The reinforcing plate is disposed in
abutment with an exterior cover and a door panel, and is mounted on
a mounting post of the exterior cover. The reinforcing plate has a
notch to receive and engage a key lock. A securing plate may be
disposed between and in abutment with the door panel and a main
body of a torsional returning unit which is connected to an
exterior handle to further increase structural rigidity.
Inventors: |
HUANG; Tsung-Chung; (Chiayi
County, TW) ; LIU; Cheng-Chung; (Chiayi County,
TW) ; CHIANG; Wei-Liang; (Chiayi City, TW) ;
YANG; Ju-Lin; (Chiayi County, TW) ; SHYU;
Song-Gen; (Chiayi County, TW) ; KUO; Ching-Chuan;
(Chiayi County, TW) |
Family ID: |
46451104 |
Appl. No.: |
13/537840 |
Filed: |
June 29, 2012 |
Current U.S.
Class: |
70/107 |
Current CPC
Class: |
Y10T 70/7655 20150401;
E05B 3/00 20130101; E05B 15/02 20130101; E05B 63/0069 20130101;
Y10T 70/8541 20150401; E05B 59/00 20130101; E05B 9/084 20130101;
Y10T 70/5226 20150401; Y10T 70/8973 20150401; E05B 17/2084
20130101 |
Class at
Publication: |
70/107 |
International
Class: |
E05B 59/00 20060101
E05B059/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 30, 2011 |
TW |
100211994 |
Claims
1. A mortise lock mountable on a door panel, comprising: a latch
unit having a key lock hole; an exterior cover having a base plate
portion, an aperture formed in said base, plate portion in
alignment with said key lock hole, a mounting post projecting
inwardly from an inner surface of said base plate portion, a
peripheral wall projecting inwardly and laterally from said base
plate portion and surrounding said aperture and said mounting post;
a key lock disposed in said aperture and said key lock hole, said
key lock being interlocked with said key lock hole and having an
outer periphery that is formed with a first engaging part; and a
reinforcing plate mounted on said mounting post and disposed around
said key lock, said reinforcing plate including a mounting post
hole disposed around said mounting post, a notch that receives said
key lock, and a second engaging part disposed in proximity to said
notch to engage said first engaging part, said reinforcing plate
abutting against said base plate portion and having a lateral
flange that projects inwardly away from said base plate portion and
that has an inner end substantially flush with an inner end of said
peripheral wall of said exterior cover, said lateral flange being
adapted to abut against the door panel.
2. The mortise lock of claim 1, wherein said peripheral wall has an
upper wall, a lower wall, and two opposite sidewalls
interconnecting said upper and lower walls, said reinforcing plate
further including an upper edge abutting against said upper wall, a
lower edge, and two opposite sides interconnecting said upper and
lower edges, a pair of said lateral flanges being formed
respectively at said opposite sides substantially in parallel to
said opposite sidewalls, said notch being indented upwardly from
said lower edge.
3. The mortise lock of claim 2, wherein said lateral flanges abut
against said opposite sidewalls of said exterior cover,
respectively.
4. The mortise lock of claim 1, further comprising a torsional
returning unit and a securing plate, said exterior cover further
having a pair of internally threaded securing post, said torsional
returning unit being mounted on said securing posts and disposed
between said exterior cover and said securing plate, said securing
plate having securing post holes each of which is disposed around
one of said securing posts.
5. The mortise lock of claim 4, wherein said torsional returning
unit has a four-sided main body, and a cam member mounted on said
main body and having a cam hole, said securing plate further having
two opposite clamp parts clamping two opposite sides of said main
body, and a transmission rod hole aligned with said cam hole,
another two opposite sides of said main body abutting against said
peripheral wall of said exterior cover.
6. The mortise lock of claim 5, wherein said securing plate further
has at least one recess that receives said cam member and that is
arcuated to extend around said transmission rod hole, and at least
one boss that is formed oppositely of said recess and that is
arcuated to extend around said transmission rod hole, said boss
being adapted to protrude into a hole in a door panel.
7. The mortise lock of claim 6, wherein said recess has two
angularly spaced stop elements, said cam member being rotatable
limitedly between said stop elements.
8. A mortise lock comprising: a latch unit having a key lock hole;
an exterior cover having a base plate portion, an aperture formed
in said base plate portion in alignment with said key lock hole, a
securing post projecting inwardly from an inner surface of said
base plate portion, and a peripheral wall projecting inwardly and
laterally from said base plate portion and surrounding said
aperture and said securing post; a key lock extending through said
aperture and interlocked with said key lock hole; a securing plate
mounted on said securing post, and having a securing post hole
disposed around said securing post, and a transmission rod hole; an
exterior handle attached to said exterior cover; a torsional
returning unit having a main body that is mounted on said securing
post and that is disposed between said exterior cover and said
securing plate, and a cam member that projects from said main body
to said securing plate; and a transmission rod connected to said
exterior handle to actuate said latch unit and extending through
said cam member and said transmission rod hole; said securing plate
having an outer side engaging said main body and an inner side
adapted to engage the door panel.
9. The mortise lock of claim 8, wherein said exterior cover further
has a mounting post, said securing plate further having a mounting
post hole disposed around said mounting post.
10. The mortise lock of claim 8, wherein said securing plate
further has at least one recess that is formed at said outer side
to receive said cam member and that is arcuated to extend around
said transmission rod hole, and at least one boss that is formed at
said inner side and that is arcuated to extend around said
transmission rod hole, said boss being adapted to engage a hole in
a door panel.
11. The mortise lock of claim 10, wherein said recess has two
angularly spaced stop elements, said cam member being rotatable
limitedly between said stop, elements.
12. The mortise lock of claim 8, wherein said securing plate
further has two opposite clamp parts disposed at said outer side to
engage two opposite sides of said main body, another two opposite
sides of said main body abutting against said peripheral wall of
said exterior cover.
13. A mortise lock comprising: a latch unit having a key lock hole;
an exterior cover having a base plate portion, an aperture formed
in said base plate portion in alignment with said key lock hole, a
pair of mounting posts and a pair of securing posts, all of which
project inwardly from an inner surface of said base plate portion,
and a peripheral wall projecting inwardly and laterally from said
base plate portion and surrounding said aperture and said mounting
and securing posts; a key lock disposed in said aperture and said
key lock hole, said key lock being interlocked with said key lock
hole and having an outer periphery that is formed with a first
engaging part; a reinforcing plate mounted on one of said mounting
posts, disposed around said key lock and abutting against said base
plate portion, said reinforcing plate including a notch that
receives said key lock, a second engaging part disposed in
proximity to said notch to engage said first engaging part, and a
lateral flange projecting inwardly away from said base plate
portion and having an inner end substantially flush with an inner
end of said peripheral wall of said exterior cover, said lateral
flange being adapted to abut against the door panel; an exterior
handle attached to said exterior cover; a torsional returning unit
having a main body that is mounted on said securing posts, and a
cam member that projects from said main body; and a transmission
rod connected to said exterior handle to actuate said latch unit
and extending through said cam member.
14. The mortise lock of claim 13, further comprising a securing
plate mounted on said securing posts, said securing plate having
securing post holes disposed respectively around said securing
posts, a mounting post hole disposed around the other one of said
mounting posts, a transmission rod hole for extension of said
transmission rod, and a boss arcuated around said transmission rod
hole and adapted to protrude into a hole of the door panel.
15. The mortise lock of claim 14, wherein said securing plate
further has a recess that receives said cam member and that is
arcuated around said transmission rod hole.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority of Taiwanese Patent
Application No 100211994 filed on Jun. 30, 2011
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a mortise lock, and more
particularly to a mortise lock with high resistance against
destructive external pulling forces.
[0004] 2. Description of the Related Art
[0005] A mortise lock typically includes a latch unit that includes
a deadbolt and a live bolt and that can be operated through a key
lock or an exterior handle at an outside of a door, or through a
rotary button or an interior handle at an inside of the door. The
key lock is formed with an external screw thread, and the latch
unit has a threaded hole to receive the key lock and to engage the
external screw thread. For installation in a door panel, the latch
unit is disposed in a latch hole disposed within the door panel and
opening at a side face of the door panel, and the key lock is
inserted into the threaded hole of the latch unit through a lock
hole formed in an outer face of the door panel. The exterior handle
is attached to an exterior-cover and the exterior cover is attached
to, an outside face of the door panel. The interior handle is
attached to an interior cover, and the interior cover is disposed
on an inside face of the door panel and is connected to the
exterior cover. An example of such a mortise lock is disclosed in
U.S. Pat. No. 7,152,442.
[0006] Generally, conventional mortise locks have no interlocking
means to interlock the key lock with the exterior cover. Because
retention of the key lock is mainly relied on an engagement between
the screw thread of the key lock and the threaded hole in the latch
unit, there is no sufficient resistance against external pulling
forces, and the key lock can be easily removed from the door panel
by burglars using destructive forces to violently pull the key lock
and to destroy the screw thread thereof for separation of the key
lock from the threaded hole of the latch unit.
SUMMARY OF THE INVENTION
[0007] An object of the present invention is to provide a mortise
lock with high structural strength to resist against destructive
external pulling forces.
[0008] According to one aspect of the present invention, a mortise
lock mountable on a door panel, comprises: a latch unit having a
key lock hole; an exterior cover having a base plate portion, an
aperture formed in the base plate portion in alignment with the key
lock hole, amounting post projecting inwardly from an inner surface
of the base plate portion, and a peripheral wall that projects
inwardly and laterally from the base plate portion to surround the
aperture and the mounting post; a key lock that is disposed in the
aperture and the key lock hole, that is interlocked with the key
lock hole, and that has an outer periphery formed with a first
engaging part; and a reinforcing plate mounted on the mounting post
and disposed around the key lock. The reinforcing plate includes a
notch that receives the key lock, and a second engaging part
disposed in proximity to the notch to engage the first engaging
part. The reinforcing plate abuts against the base plate portion
and has a lateral flange that projects inwardly away from the base
plate portion and that has an inner end substantially flush with an
inner end of the peripheral wall of the exterior cover. The lateral
flange is adapted to abut against the door panel.
[0009] According to another aspect of the invention, a mortise lock
comprises: a latch unit having a key lock hole; an exterior cover
having a base plate portion, an aperture formed in the base plate
portion in alignment with the key lock hole, a securing post
projecting inwardly from an inner surface of the base plate
portion, and a peripheral wall projecting inwardly and laterally
from the base plate portion and surrounding the aperture and the
securing post; a key lock extending through the aperture and
interlocked with the key lock hole; a securing plate mounted on the
securing post, and having a securing post hole disposed around the
securing post, and a transmission rod hole; an exterior handle
attached to the exterior cover; a torsional returning unit having a
main body that is mounted on the securing post and that is disposed
between the exterior cover and the securing plate, and a cam member
that projects from the main body to the securing plate; and a
transmission rod connected to the exterior handle to actuate the
latch unit and extending through the cam member and the
transmission rod hole. The securing plate has an outer side
engaging the main body and an inner side adapted to engage the door
panel.
[0010] According to still another aspect of the invention, a
mortise lock comprises: a latch unit having a key lock hole; an
exterior cover having a base plate portion, an aperture formed in
the base plate portion in alignment with the key lock hole, a pair
of mounting posts and a pair of securing posts, all of which
project inwardly from an inner surface of the base plate portion,
and a peripheral wall projecting inwardly and laterally from the
base plate portion and surrounding the aperture and the mounting
and securing posts; a key lock disposed in the aperture and the key
lock hole, interlocked with the key lock hole, and having an outer
periphery that is formed with a first engaging part; and a
reinforcing plate mounted on one of the mounting posts, disposed
around the key lock and abutting against the base plate portion.
The reinforcing plate includes a notch that receives the key lock,
a second engaging part disposed in proximity to the notch to engage
the first engaging part, and a lateral flange projecting inwardly
away from the base plate portion and having an inner end
substantially flush with an inner end of the peripheral wall of the
exterior cover. The lateral flange is adapted to abut against the
door panel. The mortise lock, further includes an exterior handle
attached to the exterior cover; a torsional returning unit that has
a main body mounted on the securing posts, and a cam member
projecting from the main body; and a transmission rod connected to
the exterior handle to actuate the latch unit and extending through
the cam member.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Other features and advantages of the present invention will
become apparent in the following detailed description of the
preferred embodiment with reference to the accompanying drawings,
of which:
[0012] FIG. 1 is a perspective view illustrating a preferred
embodiment of the mortise lock according to the present invention
mounted on a door panel;
[0013] FIG. 2 is an exploded view of the preferred embodiment;
[0014] FIG. 3 is an exploded view showing an exterior lock unit of
the preferred embodiment;
[0015] FIG. 4 is a perspective view of a securing plate of the
preferred embodiment; and
[0016] FIG. 5 is a sectional view of the preferred embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0017] Referring to FIGS. 1 to 5, a mortise lock according to a
preferred embodiment of the present invention is mountable on a
door panel 4 and includes a latch unit 1, an exterior lock unit 2
and an interior lock unit 3. The exterior lock unit 2, includes an,
exterior cover 21, a key lock 22, a reinforcing plate 23, a
securing plate 24, a torsional returning unit 25, a transmission
rod 26, and an exterior handle 27.
[0018] The door panel 4 has a latch hole 45 formed through a side
face of the door panel 4. A key lock hole 41, a transmission rod
hole 42, two first installation holes 43, and four second
installation holes 44 are formed through an outer face of the door
panel 4.
[0019] The latch unit 1 is installed in the latch hole 45 and has a
key lock hole 11 with an internal thread 111. The latch unit 1 has
a deadbolt 11 and a live bolt 12. Since the construction of the
latch unit 1 is known and is not detailed hereinafter.
[0020] The key lock 22 has an outer periphery formed with a
threaded portion 222 and two first engaging parts 221. The first
engaging parts 221 are preferably configured as engaging grooves.
The threaded portion 222 passes through the key lock hole 41 in the
door panel 4 and is engaged with the internal thread 111 of the key
lock hole 11 in the latch unit 1.
[0021] The exterior cover 21 includes a base plate portion 211
formed with an aperture 219. Two internally threaded mounting posts
215 and two internally threaded securing posts 216 project inwardly
front an inner surface of the base plate portion 211. A peripheral
wall extends inwardly and laterally from the base plate portion 211
and includes two sidewalls 212, an upper wall 213, and a lower wall
217. The peripheral wall surrounds the aperture 214, the mounting
posts 215 and the securing posts 216.
[0022] The reinforcing plate 23 has an upper edge 234, a lower edge
231, two opposite sides that interconnect the upper edge 234 and
the lower edge 231 and that are formed respectively with lateral
flanges 232, a mounting post hole 233 formed between the upper edge
234 and the lower edge 231, a notch 236 indented upwardly from the
lower edge 231, and two opposite second, engaging parts 235 formed
in proximity to the notch 236. The notch 236 receives the key lock
22. The second engaging parts 235 are engaging edges that bound the
notch 236 and that respectively engage the first engaging parts 221
of the key lock 22. The mounting post hole 233 is disposed around
one of the mounting posts 215 proximate to the upper wall 213. An
outer surface of the reinforcing plate 23 abuts against the base
plate portion 211. The lateral flanges 232 of the reinforcing plate
23 project inwardly away from the base plate portion 211. The upper
edge 234 and the lateral flanges 232 respectively abut against the
upper wall 213 and the sidewalls 212 of the exterior cover 21. The
lateral flanges 232 are substantially parallel to the sidewalls 212
and have inner ends that are substantially flush with inner ends of
the side walls 212 and that are adapted to abut against the door
panel 4.
[0023] The torsional returning unit 25 has a four-sided main body
250 that has four sides 253, a cam member 251 rotatably mounted to
the main body 250, a cam hole 254 formed in the cam member 251, and
four lateral through holes 252 formed around the cam hole 254. The
main body 250 is mounted on the securing posts 216 and is disposed
between the exterior cover 21 and the securing plate 24. Two of the
lateral through holes 252 are disposed around the two securing
posts 216, respectively.
[0024] The exterior handle 27 is attached movably to the exterior
cover 21.
[0025] The securing plate 24 has two spaced apart clamp parts 241
protruding from the securing plate toward the main body 250, a
transmission rod hole 245 formed between the clamp parts 241, two
spaced apart bosses 243 protruding from the securing plate 24 and
arcuated to extend around the transmission rod hole 245, two spaced
apart recesses 247 arcuated to extend around the transmission hole
245 oppositely of the bosses 243, and stop elements 246 formed
within the recesses 247. The bosses 243 protrude into the
transmission rod hole 42 in the door panel 4 so that the inner side
of the securing plate 24 is in engagement with the door panel 4.
The cam member 251 is received rotatably in the recesses 247. Each
recess 247 has two angularly spaced apart shoulders which serve as
the stop elements 246. The stop elements 246 function to limit a
rotation angle of the cam member 251. Preferably, the securing
plate 24 is a stamped plate that has a bent area to form the bosses
243, the recesses 247, and the stop elements 246. An inner surface
of the bent area is protruded inwardly to form the bosses 243, and
an outer surface of the bent area is indented to form the recesses
247.
[0026] The main body 250 of the torsional returning unit 25 has two
opposite sides 253 respectively abutting against the sidewalls 212
of the exterior cover 21, and two other opposite sides 233 clamped
by the clamp parts 241 of the securing plate 24. The main body 250
is therefore in engagement with an outer side of the securing plate
24.
[0027] The securing plate 24 further has four securing post holes
242, and a mounting post hole 244. Two of the securing post holes
242 are disposed around the securing posts 216, respectively. The
mounting post hole 244 is disposed around the mounting post 215
proximate to the lower wall 217. The transmission rod 26 has one
end connected to the exterior handle 27. The transmission rod 26 is
also connected to the cam member 251 and extends through the cam
hole 254 of the cam member 251. The transmission rod 26 is inserted
into the latch unit 1 through the transmission rod hole 245 in the
securing plate 24 and the transmission rod hole 42 in the door
panel 4. The latch unit 1 can therefore be actuated by the
transmission rod 26.
[0028] The interior lock unit 3 includes an interior handle 33, an
interior button 32, an interior cover 31, a securing plate 34 and a
torsional returning unit 35. The construction of the securing plate
34 and the torsional returning unit 35 is the same as that of the
securing plate 24 and the torsional returning unit 25 of the
exterior lock unit 2. Two screws 28 and two screws 29 are used to
secure the interior lock unit 2 to, the mounting posts 215 and the
securing posts 216, respectively.
[0029] In use, the deadbolt 11 may be actuated by operating the key
lock 22 at an outside of the door panel 4 or by operating the
rotary button 32 at an inside of the door panel 4. The live bolt 12
may be actuated by operating the exterior handle 27 or the interior
handle 33.
[0030] With the reinforcing plate 23 which is disposed in abutment
with the base plate portion 211 of the exterior cover 21 and which
has lateral flanges 232 to abut against the door panel 4, the
mortise lock of the present invention possesses high structural
rigidity and robustness. The structural rigidity of the mortise
lock is further increased by the securing plate 24 that is mounted
on the securing posts 216 in abutment with the torsional returning
unit 25 and the door panel 4.
[0031] While the present invention has been described in connection
with what is considered the most practical and preferred
embodiments, it is understood that this invention is not limited to
the disclosed embodiment but is intended to cover various
arrangements included within the spirit and scope of the broadest
interpretation so as to encompass all such modifications and
equivalent arrangements.
* * * * *